I think the suggestion is that Robert Gadney senior was born about 1640. He had at least three sons: Robert, John and Thomas. Possibly he came originally from Wytham.
In 1641, in the Oxfordshire Protestation Returns, there was a Thomas Gadney at Wytham.
file:///Users/vancemead/Downloads/59%20THE%20OXFORDSHIRE%20RECORD%20SOCIETY%201994%20VOLUME%2059%20(1).pdf